AI agents call eval_gate to retrieve information from Novyx without modifying anything — typically the context-gathering step in research, monitoring, and reporting workflows, before the agent takes action elsewhere.
This is a gating/evaluation function that reads a memory health score and returns a pass/fail result. It has no side effects; it does not execute code, delete data, modify state, or commit financial transactions. It is purely a read operation that assesses a metric and reports the outcome, similar to a health check or validation gate in CI/CD pipelines.
From the tool's definition Tool description states 'pass or fail based on memory health score' — evaluates and reports a condition without modifying data or triggering external actions. No destructive, financial, or execution keywords present.
Documented attack patterns abuse exactly the kind of access eval_gate gives an agent:
PolicyLayer is an MCP gateway — it sits between your AI agents and Novyx, and nothing reaches the server without passing your rules. This is the rule we recommend for eval_gate:
{
"version": "1",
"default": "deny",
"tools": {
"eval_gate": {}
}
}eval_gate is read-only, so it stays allowed — but everything else on the server is denied unless you say otherwise.
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CI gate — pass or fail based on memory health score. It is categorised as a Read tool in the Novyx MCP Server, which means it retrieves data without modifying state.
Register the Novyx MCP server in PolicyLayer and add a rule for eval_gate: allow, deny, rate-limit, or require approval. Point your MCP client at the PolicyLayer proxy URL and the rule is enforced on every call, before it reaches Novyx. Nothing to install.
eval_gate is a Read tool with low risk. Read-only tools are generally safe to allow by default.
Yes. Add a rate_limit block to the eval_gate rule in your PolicyLayer policy. For example, setting max: 10 and window: 60 limits the tool to 10 calls per minute. Rate limits are tracked per agent session and reset automatically.
Set action: deny in the PolicyLayer policy for eval_gate. The AI agent will receive a policy violation error and cannot call the tool. You can also include a reason field to explain why the tool is blocked.
eval_gate is provided by the Novyx MCP server (novyxlabs/novyx-mcp). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.
Deterministic rules across all 120 Novyx tools. Per-identity grants. Full audit log. Live in minutes. Nothing to install.
Free to start. No card required.
120 Novyx tools catalogued and risk-classified — across an index of 42,500+ MCP servers.